Nice entry with good impact feedback
I like the overall idea of the surviving waves of enemies challenge, and the progress bar below showing how close you're getting to the boss is a nice idea.
Now i get that since it's the theme the movement is confined in a way, but i didn't fully understand how it worked, as i had to tap the direction keys rather than hold them to move ? That felt a bit confusing.
But that's about the only negative thing i have to say really, the rest is really cool, the sprites have their charm especially the little star shaped player starship, the music fits the atmosphere well, and the menu Ui is clear and has some nice sound effects.
Well done :)